20747912 has 16 divisors (see below), whose sum is σ = 39304860. Its totient is φ = 10266624.

The previous prime is 20747899. The next prime is 20747929. The reversal of 20747912 is 21974702.

It can be written as a sum of positive squares in 2 ways, for example, as 20666116 + 81796 = 4546^2 + 286^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12593 + ... + 14144.

Almost surely, 2^20747912 is an apocalyptic number.

It is an amenable number.

20747912 is a deficient number, since it is larger than the sum of its proper divisors (18556948).

20747912 is a wasteful number, since it uses less digits than its factorization.

20747912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26840 (or 26836 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 20747912 is about 4554.9875960314. The cubic root of 20747912 is about 274.7840155346.

The spelling of 20747912 in words is "twenty million, seven hundred forty-seven thousand, nine hundred twelve".